Cluster magnetic fields from large-scale-structure and galaxy-cluster shocks

Details Cluster magnetic fields from large-scale-structure and galaxy-cluster shocks Cluster magnetic fields from large-scale-structure and galaxy-cluster shocks

2005-12-04

arxiv.org/abs/astro-ph/0512079v1

Astrophys.J.642:L1-L4,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 color figures

Scientific paper

10.1086/504470

The origin of the micro-Gauss magnetic fields in galaxy clusters is one of the outstanding problem of modern cosmology. We have performed three-dimensional particle-in-cell simulations of the nonrelativistic Weibel instability in an electron-proton plasma, in conditions typical of cosmological shocks. These simulations indicate that cluster fields could have been produced by shocks propagating through the intergalactic medium during the formation of large-scale structure or by shocks within the cluster. The strengths of the shock-generated fields range from tens of nano-Gauss in the intercluster medium to a few micro-Gauss inside galaxy clusters.

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